Answer this question truthfully
### Question: When to seek urgent medical care when I have Yellow fever ?
### Response: A person with advanced yellow fever may show signs of liver failure, renal failure, and shock. Tell your health care provider right away if you or your child develop fever, headache, muscle aches, vomiting, or jaundice, especially if you have traveled to an area where yellow fever is known to occur. Blood tests can confirm the diagnosis.